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#2401743 - 11/10/17 11:39 PM 4.125/ 4.250" stroke stock block SB combos
mshred Offline
master

Registered: 04/08/09
Posts: 3336
Loc: Toronto
Wondering who is running bigger then a 4" crank in a production block SB and what your combos are performing like? Thinking about maybe going to a larger crank then 4" if it's worth it

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#2401752 - 11/11/17 12:29 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
B3422W5 Offline
master

Registered: 01/20/03
Posts: 9917
Loc: Portage,michigan
Cant see much use for them personally.
To me, probably about the best combo is a big bore with a 3.79ish stroke.
Dont see many if any guys running W8/9 stuff with more than a 4 inch stroke. And most of the other heads are too small to need bigger than a 4 inch arm( if that even)
_________________________
69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.

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#2401761 - 11/11/17 01:02 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
AndyF Offline
Too Many Posts

Registered: 01/20/03
Posts: 23230
Loc: Oregon
Did a 427 SB a few years ago for a street driven track car. Nice engine, made a ton of torque and pushed that car to 150+ mph on the road course at PIR.

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#2401793 - 11/11/17 08:03 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
MoparBilly Offline
master

Registered: 01/20/03
Posts: 4167
Loc: Phoenix, AZ
Street Combo or Race only???

The 4.125 arm from Bloomer has 2.00 journals and uses the 6.200 chevy rod with a .927 pin, so it fits in the block much better than the 4 inch kits with the stock size rods.
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"Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines

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#2401803 - 11/11/17 08:21 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: B3422W5]
pittsburghracer Offline
Slowride

Registered: 02/02/05
Posts: 11896
Loc: PA.
Originally Posted By B3422W5
Cant see much use for them personally.
To me, probably about the best combo is a big bore with a 3.79ish stroke.
Dont see many if any guys running W8/9 stuff with more than a 4 inch stroke. And most of the other heads are too small to need bigger than a 4 inch arm( if that even)





These guys wind the heck out of their engines to get the power out of them. I will be researching this shortly myself for my 360-1 heads or if I strike gold possibly a set of Edelbrock Victors. This is my bracket piece so I refuse to beat on it to bad.
_________________________
1970 Duster
Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23

https://flic.kr/p/WjECmg

[img]http://i.imgur.com/Z4SvNU4.jpg?1[/img]



Untitled by John Cadamore, on Flickr





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#2401834 - 11/11/17 09:17 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
J_BODY Offline
I Live Here

Registered: 04/30/03
Posts: 11122
Loc: aZLiViN
Maybe the rainbow chasers John.... but lil ole bracket guy, that enjoys a nice 9 sec pass, like myself I don't feel like I've "beaten" on my stuff. 6800 shift point, trap at 7200. I could put the 4.3 gear back in and trap at 7K. While it bothers me that with the parts I have I could REALLY have some fun.... my bank account thanks me for our "mild" decisions. smile btw, 4" stroke here with 6" rod.

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#2401843 - 11/11/17 09:30 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
FurryStump Offline
top fuel

Registered: 10/15/04
Posts: 2441
Loc: Connecticut
Really the question is what head are you running and what does it flow. I run with another small block guy. Running 4.250 crank to get to 444 CI. Because we run stock appearing we have to run production cast iron head. X heads in this case. You really are asking a lot of the x head to flow 444ci. The block is half filled. Performance wise you need a serious head to use the CI. Longevity wise jury is still out for me, with a stock block I personally don't know of one that for other reasons has stayed together for long period. Such as car was sold,something else broke,ect. Strokers hide power which is why they are popular with stock appearing. just my two cents I think I plan on 427 inch limit for the next build, but it's a couple years away and everything's subject to change.
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best of 12.10@113mph 68 340 formula s fastback,Money delete option,Supercar shootout stock appearing.

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#2401869 - 11/11/17 10:08 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
mopar dave Offline
master

Registered: 01/04/07
Posts: 5236
Loc: flint michigan
I agree with Don. I have seen alot of fast combos using that 3.79 stroke. If i were to do another sb project some what budget build like i do, i would search out a good x block and use the 3.79 crank with w9' s or edel victors. Gm and mopar used a 3 3/4 stroke in a few motors, must be some thing good about it .

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#2402020 - 11/11/17 03:05 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mopar dave]
MoparBilly Offline
master

Registered: 01/20/03
Posts: 4167
Loc: Phoenix, AZ
Originally Posted By mopar dave
I agree with Don. I have seen alot of fast combos using that 3.79 stroke. If i were to do another sb project some what budget build like i do, i would search out a good x block and use the 3.79 crank with w9' s or edel victors. Gm and mopar used a 3 3/4 stroke in a few motors, must be some thing good about it .


Exactly what I had. Replaced the 3.79 crank and 12.5 pistons with a 4.125 crank and dish pistons. More power, and runs on pump gas, so I'll never go back. Listed the 3.79 crank on here for 300 bucks, no takers.
_________________________
"Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines

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#2402031 - 11/11/17 03:23 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
DavidDean Offline
pro stock

Registered: 03/28/03
Posts: 1472
Loc: Lubbock,TX
I use an X block on my bloomer 4.250 w/ Indy 360-1. I shift at 6500. It’s been 5.66
My R block molnar 4.125 W-8 had been 5.53 at 3000’ DA shifting at 7200. I might be a little afraid of a stock block, if I used on I’d sure use a girdle or something to beef the bottom end

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#2402039 - 11/11/17 03:38 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
mshred Offline
master

Registered: 04/08/09
Posts: 3336
Loc: Toronto
Street and strip, and I know my heads may be a limiting factor (stock indy 360-2 cnc 230 heads). I have had my engine up for sale to go BB since nitrous is out of hand in price here now, but havent had much interest so I am going to pull and freshen it... I thought about going to bigger stroke, porting the heads and running n/a. Its a stock block but half filled, and it already has a 4" crank.

Would it be worth it to go bigger? Id like to stay pump gas but raise cr from where it is now (10.4:1)

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#2402041 - 11/11/17 03:39 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: DavidDean]
mopar dave Offline
master

Registered: 01/04/07
Posts: 5236
Loc: flint michigan
Theres a guy over on the east coast(Steve Clukey) that uses a sb n/a combo using an X block. Not sure the stroke, but spins that thing to 8000-8500rpm on shifts. Its in a duster and has been in the high 8's. Very impressive sb.

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#2402246 - 11/11/17 08:36 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: MoparBilly]
madscientist Offline


Registered: 09/17/14
Posts: 1657
Loc: Washington
Originally Posted By MoparBilly
Originally Posted By mopar dave
I agree with Don. I have seen alot of fast combos using that 3.79 stroke. If i were to do another sb project some what budget build like i do, i would search out a good x block and use the 3.79 crank with w9' s or edel victors. Gm and mopar used a 3 3/4 stroke in a few motors, must be some thing good about it .


Exactly what I had. Replaced the 3.79 crank and 12.5 pistons with a 4.125 crank and dish pistons. More power, and runs on pump gas, so I'll never go back. Listed the 3.79 crank on here for 300 bucks, no takers.



PM sent.
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Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

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#2402269 - 11/11/17 09:04 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: madscientist]
Frackster Offline
member

Registered: 09/21/12
Posts: 24
I have a set of w9's that would go great with that.

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#2402282 - 11/11/17 09:35 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
HotRodDave Offline
master

Registered: 01/29/05
Posts: 9449
Loc: Kalispell Mt.
4.25 stroke SBs are awesome. All the crap about the heads not being big enough out there is bull pucky. An x head flows almost what a 906 BB head does and tons of guys are running them on 440 CID engines. A decent ported eddy SB head flows about what a ported 906 does and again lots of 440s run great with 906s. A good W2 flows similar to a decent eddy BB head and again tons of guys running them on 440-512 CID engines.

The real question should be how many cubes X RPM do you want to turn. I always build the biggest bottem end the budget can aford, nothing like loafing along at low RPM and still posting great time slips.
_________________________
I am not causing global warming, I am just trying to hold off a impending Ice Age!

68 cuda 360 notchback SOLD

1996 Ram 2500 5.9 eddy intake EQ heads, mild cam upgrade great tow rig!


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#2402288 - 11/11/17 09:43 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: HotRodDave]
B3422W5 Offline
master

Registered: 01/20/03
Posts: 9917
Loc: Portage,michigan
Originally Posted By HotRodDave
4.25 stroke SBs are awesome. All the crap about the heads not being big enough out there is bull pucky. An x head flows almost what a 906 BB head does and tons of guys are running them on 440 CID engines. A decent ported eddy SB head flows about what a ported 906 does and again lots of 440s run great with 906s. A good W2 flows similar to a decent eddy BB head and again tons of guys running them on 440-512 CID engines.

The real question should be how many cubes X RPM do you want to turn. I always build the biggest bottem end the budget can aford, nothing like loafing along at low RPM and still posting great time slips.


Yeah. And guess what stroke those 440's with smallish heads that run good are using..... 3.75.
Nothing wrong with those huge strokes i guess. But on a dinky bore and will all the side loading and terrible rod ratios.... why? Especially for a race only motor. Are guys running them and naking power, sure. Just to me, that 3.80 ish stroke and a big bore seems optimal.
_________________________
69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.

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#2402290 - 11/11/17 09:47 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: B3422W5]
pittsburghracer Offline
Slowride

Registered: 02/02/05
Posts: 11896
Loc: PA.
Comparing apple to apples I’m gonna say about .20 difference between we shall say a 408 and a stock stroke 360.
_________________________
1970 Duster
Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23

https://flic.kr/p/WjECmg

[img]http://i.imgur.com/Z4SvNU4.jpg?1[/img]



Untitled by John Cadamore, on Flickr





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#2402303 - 11/11/17 10:05 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: pittsburghracer]
B3422W5 Offline
master

Registered: 01/20/03
Posts: 9917
Loc: Portage,michigan
Originally Posted By pittsburghracer
Comparing apple to apples I’m gonna say about .20 difference between we shall say a 408 and a stock stroke 360.


Years ago when Hensley built my first stroker( 416) i asked Ken Hensley( who i have a ton of respect for) what difference there was between a 340 and a 416 all other things being the same. He said 3 tenths. Never forgot him saying that.
Real world, my 360 has run 11.20's at 10.4 compression with mild eddies at 3300 with a 727.
My little brother has a new 416 with max effort Shady Dell eddies, 12+ compression, same weight, and he has a 904. Admittedly he is having teething issues with it, but thus far he has been 10.95 at 120. 1.5 mph faster and 3 tenths quicker, and he has a 904, which is definately quicker. I am sure it will run a good bit better, but so would mine with a 904 i have on the shelf and a convertor correctly specced( one in car car now is a tight 4500 flash) devinately "off" with what i have.
So yea John, i agree. Why toss that huge crank around for not much gain. 4 inch to me is more than plenty.
_________________________
69 Dart GTS, performance upgrades in progress
11.26@ 118.40 best so far. Stock 360 shortblock with eddie heads.

Top
#2402320 - 11/11/17 10:41 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: B3422W5]
mopar dave Offline
master

Registered: 01/04/07
Posts: 5236
Loc: flint michigan
I agree. when I first replaced my 12:1 ported J head 340 with my w2 headed 408 I was very disappointed. Ran the same 4 speed and 4.10 gears although the 408 was 10.5:1. took me another 6-8yrs to get it in the mid tens. That 340 was a very impressive street/strip motor. It would be fun to do a x block with the 3.79 crank roller cam and w9 or victor head. I would think it would last along time buzzing it to 7-7500.

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#2402327 - 11/11/17 11:03 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mopar dave]
pittsburghracer Offline
Slowride

Registered: 02/02/05
Posts: 11896
Loc: PA.
I have a 4.100 bore 48 degree R block sitting here with a 3.79 billet crank, roller cam and lifters, two sets of pistons, a set of Arrow rods, a W7 intake, and Jessel rockers for W7 heads. The deal was to good to pass up so some day I may see what this combo will run. I think it would be an interesting project


Edited by pittsburghracer (11/11/17 11:04 PM)
_________________________
1970 Duster
Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23

https://flic.kr/p/WjECmg

[img]http://i.imgur.com/Z4SvNU4.jpg?1[/img]



Untitled by John Cadamore, on Flickr





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